Home Postcode finder QLD Seventy Mile Seventy Mile postcode QLD Seventy Mile is a locality in Queensland covered by postcode 4820. Postcode 4820 State or territory Queensland (QLD) Region North QLD Add a free Seventy Mile business listing Be the first listing in Seventy Mile Common questionsWhat is the postcode for Seventy Mile?Seventy Mile, QLD has the postcode 4820.What state is Seventy Mile in?Seventy Mile is in Queensland (QLD).Does postcode 4820 cover more than one suburb?Yes. Postcode 4820 covers 21 localities, so the postcode alone does not identify Seventy Mile. Browse other postcodes in Queensland, or widen the search to every Australian postcode.